strength міцність 22 прочность 5 plasticity 4 steel 4 пластичність 4 сталь 4 UDC 539.3 2 aerodynamic loads 2 aluminium alloys 2 amplification 2 analytical method 2 axial main ventilation fan 2 carbon equivalent 2 cast iron 2 casting 2 conductivity 2 crack resistance 2 current density 2 diagnostics 2 dielectric permittivity 2 electric field 2 fan impeller 2 hardness 2 heat transfer problem 2 hydrogen 2 hydrogen embrittlement 2 insulation 2 mechanical properties 2 micro-inclusion 2